<template>
  <view>
    <view class="search-box">
      <uni-search-bar @input="input" placeholder="请输入搜索内容" cancelButton="none" radius="18" bgColor="#fff" focus="true"></uni-search-bar>
    </view>
    <!-- 搜索建议 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域-->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clear"></uni-icons>
      </view>
      <!-- 列表区域-->
      <view class="history-list">
        <uni-tag :text="item"  v-for="(item, i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:'',
        searchResults:[],
        historyList:[] 
      };
    },
    onLoad() {
    this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout( () => {
          this.kw = e
          this.getSearchResults()
        },500)
      },
      async getSearchResults() {
        this.saveSearchHistory()
        if(this.kw === 0) return
        this.searchResults = []
       const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query: this.kw})
       if(res.meta.status !== 200) return uni.$showMsg()
       this.searchResults = res.message
      },
      gotoDetail(item) {
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchHistory() {
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        
        // 对关键字进行本地持久化存储
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clear() {
        this.historyList = []
        uni.setStorageSync('kw', '[]')
      },
      gotoGoodsList(kw) {
        uni.navigateTo({
          url:'../goods_list/goods_list?query=' + kw
        })
      }
    },
    computed: {
      histories() {
        return [...this.historyList].reverse() 
      }
    }
  }
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
  background-color: #C00000;
}
.sugg-list {
  padding: 0 5px;
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 13px 0;
    font-size: 12px;
    border-bottom: 1px solid #efefef;
    .goods-name{
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      margin-right: 5px;
    }
  }
}
.history-box {
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    padding: 5px 0;
    border-bottom: 1px solid #efefef;
  }
  .history-list {
   .uni-tag {
     margin-top: 5px;
     margin-right: 5px;
   }
  }
}
</style>
